There is a respectable split among vernacularists whether "wazoo" applies to one's rump or one's porker. Ample weight for both definitions. See the delightful examplebelow for both possible interpretations -- tuchus and ding-dong.
"How's your Father?
How's your Mother?
How's your charming sister Sue?
And, speaking of your family, how's your old Wazoo?"